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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: MethodInvokeNode.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.expr;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Function;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Lists;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.lang.reflect.InvocationTargetException;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.lang.reflect.Method;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.LinkedHashSet;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.List;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.Set;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.parse.ParseSession;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>/**<a name="line.21"></a>
<span class="sourceLineNo">022</span> * {@link Node} that invokes a Java method when evaluated.<a name="line.22"></a>
<span class="sourceLineNo">023</span> */<a name="line.23"></a>
<span class="sourceLineNo">024</span>public class MethodInvokeNode implements Node {<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    private final Class&lt;?&gt; klass;<a name="line.26"></a>
<span class="sourceLineNo">027</span>    private final Node node;<a name="line.27"></a>
<span class="sourceLineNo">028</span>    private final String name;<a name="line.28"></a>
<span class="sourceLineNo">029</span>    private final List&lt;Node&gt; paramNodes;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>    /**<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * Constructor for static method invocation.<a name="line.32"></a>
<span class="sourceLineNo">033</span>     *<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * @param klass class containing static method<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * @param name static method name<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * @param paramNodes method parameters<a name="line.36"></a>
<span class="sourceLineNo">037</span>     */<a name="line.37"></a>
<span class="sourceLineNo">038</span>    public MethodInvokeNode(Class&lt;?&gt; klass, String name, List&lt;Node&gt; paramNodes) {<a name="line.38"></a>
<span class="sourceLineNo">039</span>        this(name, paramNodes, klass, null);<a name="line.39"></a>
<span class="sourceLineNo">040</span>        if (klass == null)<a name="line.40"></a>
<span class="sourceLineNo">041</span>            throw new IllegalArgumentException("null klass");<a name="line.41"></a>
<span class="sourceLineNo">042</span>    }<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>    /**<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * Constructor for instance method invocation.<a name="line.45"></a>
<span class="sourceLineNo">046</span>     *<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @param node node evaluating to target object<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * @param name instance method name<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * @param paramNodes method parameters<a name="line.49"></a>
<span class="sourceLineNo">050</span>     */<a name="line.50"></a>
<span class="sourceLineNo">051</span>    public MethodInvokeNode(Node node, String name, List&lt;Node&gt; paramNodes) {<a name="line.51"></a>
<span class="sourceLineNo">052</span>        this(name, paramNodes, null, node);<a name="line.52"></a>
<span class="sourceLineNo">053</span>        if (node == null)<a name="line.53"></a>
<span class="sourceLineNo">054</span>            throw new IllegalArgumentException("null node");<a name="line.54"></a>
<span class="sourceLineNo">055</span>    }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>    private MethodInvokeNode(String name, List&lt;Node&gt; paramNodes, Class&lt;?&gt; klass, Node node) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>        if (name == null)<a name="line.58"></a>
<span class="sourceLineNo">059</span>            throw new IllegalArgumentException("null target");<a name="line.59"></a>
<span class="sourceLineNo">060</span>        if (paramNodes == null)<a name="line.60"></a>
<span class="sourceLineNo">061</span>            throw new IllegalArgumentException("null paramNodes");<a name="line.61"></a>
<span class="sourceLineNo">062</span>        for (Node paramNode : paramNodes) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>            if (paramNode == null)<a name="line.63"></a>
<span class="sourceLineNo">064</span>                throw new IllegalArgumentException("null paramNode in list");<a name="line.64"></a>
<span class="sourceLineNo">065</span>        }<a name="line.65"></a>
<span class="sourceLineNo">066</span>        this.klass = klass;<a name="line.66"></a>
<span class="sourceLineNo">067</span>        this.node = node;<a name="line.67"></a>
<span class="sourceLineNo">068</span>        this.name = name;<a name="line.68"></a>
<span class="sourceLineNo">069</span>        this.paramNodes = paramNodes;<a name="line.69"></a>
<span class="sourceLineNo">070</span>    }<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span>    @Override<a name="line.72"></a>
<span class="sourceLineNo">073</span>    public Value evaluate(final ParseSession session) {<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>        // Evaluate params<a name="line.75"></a>
<span class="sourceLineNo">076</span>        final Object[] params = Lists.transform(paramNodes, new Function&lt;Node, Object&gt;() {<a name="line.76"></a>
<span class="sourceLineNo">077</span>            @Override<a name="line.77"></a>
<span class="sourceLineNo">078</span>            public Object apply(Node param) {<a name="line.78"></a>
<span class="sourceLineNo">079</span>                return param.evaluate(session).get(session);<a name="line.79"></a>
<span class="sourceLineNo">080</span>            }<a name="line.80"></a>
<span class="sourceLineNo">081</span>        }).toArray();<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>        // Handle static method<a name="line.83"></a>
<span class="sourceLineNo">084</span>        if (this.klass != null)<a name="line.84"></a>
<span class="sourceLineNo">085</span>            return this.invokeMethod(this.klass, null, name, params);<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>        // Handle instance method<a name="line.87"></a>
<span class="sourceLineNo">088</span>        final Object obj = this.node.evaluate(session).checkNotNull(session, "method " + name + "() invocation");<a name="line.88"></a>
<span class="sourceLineNo">089</span>        return this.invokeMethod(obj.getClass(), obj, name, params);<a name="line.89"></a>
<span class="sourceLineNo">090</span>    }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>    private Value invokeMethod(Class&lt;?&gt; cl, Object obj, String name, Object[] params) {<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>        // Try interface methods<a name="line.94"></a>
<span class="sourceLineNo">095</span>        for (Class&lt;?&gt; iface : this.addInterfaces(cl, new LinkedHashSet&lt;Class&lt;?&gt;&gt;())) {<a name="line.95"></a>
<span class="sourceLineNo">096</span>            for (Method method : iface.getMethods()) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>                final Value value = this.tryMethod(method, obj, name, params);<a name="line.97"></a>
<span class="sourceLineNo">098</span>                if (value != null)<a name="line.98"></a>
<span class="sourceLineNo">099</span>                    return value;<a name="line.99"></a>
<span class="sourceLineNo">100</span>            }<a name="line.100"></a>
<span class="sourceLineNo">101</span>        }<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>        // Try class methods<a name="line.103"></a>
<span class="sourceLineNo">104</span>        for (Method method : cl.getMethods()) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>            final Value value = this.tryMethod(method, obj, name, params);<a name="line.105"></a>
<span class="sourceLineNo">106</span>            if (value != null)<a name="line.106"></a>
<span class="sourceLineNo">107</span>                return value;<a name="line.107"></a>
<span class="sourceLineNo">108</span>        }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>        // Not found<a name="line.110"></a>
<span class="sourceLineNo">111</span>        throw new EvalException("no compatible method `" + name + "()' found in " + cl);<a name="line.111"></a>
<span class="sourceLineNo">112</span>    }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span>    private Set&lt;Class&lt;?&gt;&gt; addInterfaces(Class&lt;?&gt; cl, Set&lt;Class&lt;?&gt;&gt; interfaces) {<a name="line.114"></a>
<span class="sourceLineNo">115</span>        for (Class&lt;?&gt; iface : cl.getInterfaces()) {<a name="line.115"></a>
<span class="sourceLineNo">116</span>            interfaces.add(iface);<a name="line.116"></a>
<span class="sourceLineNo">117</span>            this.addInterfaces(iface, interfaces);<a name="line.117"></a>
<span class="sourceLineNo">118</span>        }<a name="line.118"></a>
<span class="sourceLineNo">119</span>        if (cl.getSuperclass() != null)<a name="line.119"></a>
<span class="sourceLineNo">120</span>            this.addInterfaces(cl.getSuperclass(), interfaces);<a name="line.120"></a>
<span class="sourceLineNo">121</span>        return interfaces;<a name="line.121"></a>
<span class="sourceLineNo">122</span>    }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>    private Value tryMethod(Method method, Object obj, String name, Object[] params) {<a name="line.124"></a>
<span class="sourceLineNo">125</span>        if (!method.getName().equals(name))<a name="line.125"></a>
<span class="sourceLineNo">126</span>            return null;<a name="line.126"></a>
<span class="sourceLineNo">127</span>        final Class&lt;?&gt;[] ptypes = method.getParameterTypes();<a name="line.127"></a>
<span class="sourceLineNo">128</span>        if (method.isVarArgs()) {<a name="line.128"></a>
<span class="sourceLineNo">129</span>            if (params.length &lt; ptypes.length - 1)<a name="line.129"></a>
<span class="sourceLineNo">130</span>                return null;<a name="line.130"></a>
<span class="sourceLineNo">131</span>            Object[] newParams = new Object[ptypes.length];<a name="line.131"></a>
<span class="sourceLineNo">132</span>            System.arraycopy(params, 0, newParams, 0, ptypes.length - 1);<a name="line.132"></a>
<span class="sourceLineNo">133</span>            Object[] varargs = new Object[params.length - (ptypes.length - 1)];<a name="line.133"></a>
<span class="sourceLineNo">134</span>            System.arraycopy(params, ptypes.length - 1, varargs, 0, varargs.length);<a name="line.134"></a>
<span class="sourceLineNo">135</span>            newParams[ptypes.length - 1] = varargs;<a name="line.135"></a>
<span class="sourceLineNo">136</span>            params = newParams;<a name="line.136"></a>
<span class="sourceLineNo">137</span>        } else if (params.length != ptypes.length)<a name="line.137"></a>
<span class="sourceLineNo">138</span>            return null;<a name="line.138"></a>
<span class="sourceLineNo">139</span>        final Object result;<a name="line.139"></a>
<span class="sourceLineNo">140</span>        try {<a name="line.140"></a>
<span class="sourceLineNo">141</span>            result = method.invoke(obj, params);<a name="line.141"></a>
<span class="sourceLineNo">142</span>        } catch (IllegalArgumentException e) {<a name="line.142"></a>
<span class="sourceLineNo">143</span>            return null;                            // a parameter type didn't match -&gt; wrong method<a name="line.143"></a>
<span class="sourceLineNo">144</span>        } catch (Exception e) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>            final Throwable t = e instanceof InvocationTargetException ?<a name="line.145"></a>
<span class="sourceLineNo">146</span>              ((InvocationTargetException)e).getTargetException() : e;<a name="line.146"></a>
<span class="sourceLineNo">147</span>            throw new EvalException("error invoking method `" + name + "()' on "<a name="line.147"></a>
<span class="sourceLineNo">148</span>              + (obj != null ? "object of type " + obj.getClass().getName() : method.getDeclaringClass()) + ": " + t, t);<a name="line.148"></a>
<span class="sourceLineNo">149</span>        }<a name="line.149"></a>
<span class="sourceLineNo">150</span>        return result != null || method.getReturnType() != Void.TYPE ? new ConstValue(result) : Value.NO_VALUE;<a name="line.150"></a>
<span class="sourceLineNo">151</span>    }<a name="line.151"></a>
<span class="sourceLineNo">152</span>}<a name="line.152"></a>
<span class="sourceLineNo">153</span><a name="line.153"></a>




























































</pre>
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